# class MasterSlaveRouter(object):
#     """数据库主从读写分离路由"""
#
#     def db_for_read(self, model, **hints):
#         """读数据库"""
#         return "slave"
#
#     def db_for_write(self, model, **hints):
#         """写数据库"""
#         return "default"
#
#     def allow_relation(self, obj1, obj2, **hints):
#         """是否运行关联操作"""
#         return True